A novel eco-friendly vapor phase corrosion inhibitor of mild steel

Purpose This paper aims to investigate the efficacy of grape pomace extract (GPE) as an eco-friendly vapor phase green inhibitor for corrosion of steel and assess the effect of the major compounds of extract on the inhibition efficiency. Design/methodology/approach The present study was carried out to identify the components present in the 2-propanol GPE by gas chromatography–mass spectrometry (GC-MS) analysis. Gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy and FTIR techniques were used to study the corrosion inhibitive. Findings GPE has inhibited mild steel corrosion in conditions of periodic condensation of moisture. The gravimetric measurement indicates that inhibition efficiency shows direct proportional relation with concentration of inhibitor. The GPE and main components acted as a mixed-type inhibitor with predominant cathodic effectiveness. Research limitations/implications. Because of the presence of large number of compounds in the extract, it becomes difficult to understand the most active compound responsible for inhibition. However, from gas chromatography, mass spectrometry and quantum data, the assumption has been made that the major compound of GPE is responsible for the inhibition activity. Practical implications The extract can be used in the temporary corrosion protection and is designed to prevent the corrosion of metal surfaces of equipment during transportation and storage. Originality/value GPE can be used as a potential source of ecofriendly corrosion inhibitor for steel corrosion.